Lorgnette.



G. WILLBERG.

LORGNETTE.

APPLICATION nun an. as, 1914.

Patented Nov. 24, 1914.

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GUSTAV 'WILLBEBG, OF RATHENOW, GERMANY, .ASSIGNOR TO THE FIRM OF GEBR'ljDEB WILLBERG, OF RATI-IENDW, GERMANY, COMPOSEID OF GUSTAV WILLBERG AND WILHELM WILLBERG.

LORGNETTE.

nuance.

Specification of Letters Patent.

Patented Nov. 24., 1914..

Application filedMarch 28, 1914. Serial No. 827,820.

To all eukom it may concern:

Be 1t known that I, GUsrAv WILLBERG, a

' subject of the Emperor of Germany, and

resident of Rathenow, in the Province of Brandenburg, Prussia, Germany, have invented certain new and useful Improvements in 'Lorgnettes, of which the following is a specification.

' This invention relates to lorgnettes, and it has for it object to provide a simple and efficient construction whereby the pupillary distance of the lenses,that is, the distance measured on a straight line between the pupils of the eyes-can be accurately adjusted. The pupillary distance of the eyes of different persons varies within comparatively wide limits, viz., from fifty-eight to sixty-five millimeters, and hence much difficulty has heretofore been experienced by dispensing Opticians in selecting lorgnettes having properly positioned lenses for each individual user. This difliculty my invention overcomes, as thereby in each particular case the requisite adjustment of the lenses can be readily effected by the Optician.

According to my invention the rim or rlms of the lenses is or are pivoted to the bridge, and means are provided whereby relative adjustment of the said-rims toward or from each other can be effected, as will be hereinafter described and claimed.

In the drawings Figure 1 is an elevation of an open lorgnette embodying my invention. Fig. 2 is a similar view of the 1orgnette closed, a part of the recessed portion of the handle being broken away to show the latch-pin. Fig. 3 is an enlarged detail, in elevation, of the adjustable connection between one of the rims and the bridge. Fig. 4 is a similar detail in longitudinal vertical section. Fig. 5 is a transverse vertical section, as on the line 55 of Fig. 4.

1, 2 designate the lens rims; 3 the brid e,

i and 4 the handle depending from one of t e rims. In the present instance each lens rim is split or divided, as at 5, through a poripheral projection 6 thereon 111N115 internally grooved, as at 7, to receive and support the lens 8; a suitably-disposed clamping screw 9 being fitted to the rim projection and adapted by its manipulation to open the rim to receive the lens, or to close the rim to secure the lens in place.

The rims are pivotally connected to the respective ends of the bridge so that the whole may be folded together as illustrated 1n F 1g. 2, or opened out as represented in Fig. 1. In the present instance the ends of the bridge are formed with laterallugs 10 which embrace end extensions 11 of the rim pro ections (3 and are hinged thereto by pivot pins 12. Each of the extensions is transversely bored to receive, a spring 13, which, encircling the pin and being secured at its respective ends to the part 11 and one of the lugs, tends to maintain the rim normally outward. Each projection 6 is provided on its top with an internallythreaded shoulder 14 in line longitudinally with the proximate end of the bridge. Fitted Within the shoulder is a set-screw 15, the

point of which is adapted to take against the of the bridge; the inward a justment of such screws reducing and the outward adjustment increasing the pupillary distance. It will also be seen that the adjustable sto s recede from the proximate ends of t 0 bridge when the rims and bridge are being swung inward on their pivotal connections, thus permitting the compact folding of the parts, with the lenses face to face, as illustrated in Fig. 2.

Although my lnvention in its broad aspect contemplates the provision of only one rim of the lorgnette with the ad ustin feature, yet I prefer to employ theplura rim adjustment hereinbefore described as thereby the equidistant disposition. of the centers of the two lenses from a line 'medially intersecting the bridge can be accurately attained.

Any suitable means to retain the members of the lorgnette in closed position may be employed. In the present instance the left rim 1 is provided with a shoulder 16 which enters a suitably-disposed recess 17 in the handle when the rims and bridge are in closed position, and is therein engaged and locked by a s ring-controlled latch pin 18 slidingly fitte within the handle, as usual.

' posing ends of the bridge to determine It is to be understood that l do not limit myself to the specific structural details shown and described as the same may be modified Without departing from my invention.

I claim 1. In a lorgnette having a bridge and spaced lens rims thereon pivotally related to each other, an adjustable rim stop coacting with the bridge to determine the pupilliary distance of the lenses insaid rims.

2. In a lorgnette having lens rims pivoted to the ends of a bridge, adjustable stops on the respective rims 'co-acting with the papillary distance of the lenses in said rims. 3. In a lorgnette having lens rims pivoted to the ends of. a bridge, springs arranged to maintain said. rims and bridge normally in open position, and an adjustable rim stop co-acting with the bridge to determine the pupillary distance of the lenses in said rims. 4. "In a lorgnette having lens rims pivoted to the ends of a bridge, springs arranged to maintain said rims and bridge normally in open position, and screw stops on said rims co-acting with the opposing outer ends of the bridge to determine the pupillary distance of the lenses in said rims.

Signed at Berlin, Prussia, this 11th day of March A. D. 1914.

Witnesses l/VOLDEMAR HAUPT, HENRY HASPER.

GUSTAV WILLBERG. 

